Same here with L470
(uname -a: 4.13.0-37-generic #42~16.04.1-Ubuntu SMP Wed Mar 7 16:03:28 UTC 2018 
x86_64 x86_64 x86_64 GNU/Linux )

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  Thinkpad T460 & Ultra Dock - No audio output on dock plug

Status in ALSA driver:
Status in alsa-driver package in Ubuntu:

Bug description:
  Thinkpad T460, Ultra dock, 2 channel speakers connected to dock.
  4.4.0-18 Kernel / 16.04.

  When the laptop is docked & speakers are connected to the dock audio
  connector, I get no audio outpout from the dock audio connector.

  Looks like the same issue as reported in:

  However the pin quirks appear to be different for the T*60 series of

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